Question

define photosynthesis

Answer 1

$\textbf{Photosynthesis}$:

6CO2 + 12H2O --chlorophyll,sunlight--> C6H1206 + 6O2 + 6H2O

It is the process by which green plants and some other organisms uses sunlight to synthesise nutrients from carbon dioxide and water. The main products forms here is glucose and by products are carbon dioxide and oxygen and water where which chlorophylls are the sites of photosynthesis.

Events occurring during Photosynthesis are as follows :

1. Absorption of light energy by chlorophyll.
2. Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen.
3. Reduction of carbon dioxide to carbohydrates.

Stages of Photosynthesis are as follows :

1. $\textbf{Light Reaction }$:
It occurs in the Grana where photon are absorbed so as to excite electrons of chlorophyll to a higher energy level. These activated electrons are harnessed to form ATP from ADP and reduce NADP to NADPH. Water is also splitted during this and oxygen is released.

2. $\textbf{Dark Reactions }$:
Calvin cycle occurring in chlorophyll here carbon dioxide combined with 5-carbon sugar call ribulose biphosphate. This unstable compound breaks down into three carbon compounds (phosphoglyeric acid) this then forms glucose.

Answer 2

$\huge\underline{\underline{\bold{Photosynthesis\::}}}$


It is the natural process by which green plants and some other organisms prepare their food (Glucose).

It occurs in Chloroplast.

$\textbf{Equation :}$

$6CO_{2}$ + $6H_{2}O$ -----› $C_{6}H_{12}O_{6}$ + $6O_{2}$

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$\textbf{Raw Materials}$

Carbon Dioxide (CO2) and Water (H2O) are the raw material of Photosynthesis.

Sunlight is need for the Photosynthesis.

Glucose (C6H12O6), Water (H2O) Oxygen (O2) are the products of Photosynthesis.

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$\textbf{Mechanism or Steps of Photosynthesis}$

→ Light energy is converted into Chemical Energy and the Water moleculesplits into Hydrogen and Oxygen.

→ Light energy of sun is absorbed by Chlorophyll.

→ Carbon-dioxide is reduced to form Glucose. And Oxygen is released into the atmosphere.

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$\textbf{Importance of Photosynthesis :}$

Photosynthesis is important because it produces oxygen as a bi-product which is necessary for living.

Also food is made by the help of this process (Photosynthesis) which is also important for living.

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$\textbf{Light and Dark Reaction :}$

Light Reaction :- It depends upon light. In this ATP and NADPH are produced.

Dark Reaction :- It doesn't depends upon light. In this Glucose ia produced.

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